NA Honda K20 not idling right

Honda, Audi, Duratec engined variants
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Muu
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Re: NA Honda K20 not idling right

Post by Muu » Sun Mar 01, 2015 9:27 am

Hole is where the butterfly meets the body at the bottom. Actual butterfly will be held shut by spring, revs are rising due to air getting into manifold another route

IDG
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Re: NA Honda K20 not idling right

Post by IDG » Sun Mar 01, 2015 1:59 pm

OK, thanks.

Let me try and make this more useful for others that may follow...

Here's the throttle body, at the right-hand end of the fat red pipe...
Image

And here's the hole to cover (slightly blurred) at the bottom of the gold circle butterfly valve...
Image
Image

IDG
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Re: NA Honda K20 not idling right

Post by IDG » Sun Mar 01, 2015 2:41 pm

So then, I cover the hole and the revs settle. Have I found my culprit (definately/most likely/perhaps/etc)?
Image

Si_F
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Re: NA Honda K20 not idling right

Post by Si_F » Sun Mar 01, 2015 5:56 pm

IDG wrote:So then, I cover the hole and the revs settle. Have I found my culprit (definately/most likely/perhaps/etc)?
Yes. Pull the throttle body and clean the iacv. You'll find that if the iacv has not been separated bofore then the 4 screws are a 5 spline torx just take them out and replace with an Allen cap head or the equivalent.

Use a light lube oil after a solvent cleaner. If you feel anything even slightly sticking or resistance it won't work properly.

IDG
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Re: NA Honda K20 not idling right

Post by IDG » Sun Mar 01, 2015 7:04 pm

:) Thanks

I did read that (with the K-pro ECU, that I have) some have removed the IACV with a blanking plate without impact.

Any thoughts on that? What's the risk?
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Si_F
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Re: NA Honda K20 not idling right

Post by Si_F » Sun Mar 01, 2015 7:57 pm

IDG wrote::) Thanks

I did read that (with the K-pro ECU, that I have) some have removed the IACV with a blanking plate without impact.

Any thoughts on that? What's the risk?
They usually clean up okay. A secondhand throttle body complete with all sensors are only £50-75 pounds. Not worth messing about with really.

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Muu
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Re: NA Honda K20 not idling right

Post by Muu » Sun Mar 01, 2015 9:12 pm

IDG wrote::) Thanks

I did read that (with the K-pro ECU, that I have) some have removed the IACV with a blanking plate without impact.

Any thoughts on that? What's the risk?
can safely say bollocks to that, unless you want to be heel and toeing at junctions to stop it stalling when cold

IDG
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Re: NA Honda K20 not idling right

Post by IDG » Sun Mar 01, 2015 9:17 pm

OK then, it can stay.

Any tips for removing the TB? There's lots of stuff going on back there.

Cheers, Ian
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Muu
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Re: NA Honda K20 not idling right

Post by Muu » Sun Mar 01, 2015 9:42 pm

Ok so there are 4 connectors you'll want to wiggle out: MAP and Purge valve atop, easy enough. TPS down the side by the bulkhead, no great shakes. The IACV is a pig in our cars as it's rubber booted, under the TB and pointing towards the bulkhead. Then 4 bolts and off she comes.

I would order up a new TB gasket from Honda though, as they are known to pull apart when you crack the TB off where it's lived for probably 10 years.

DaveP
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Re: NA Honda K20 not idling right

Post by DaveP » Sun Mar 01, 2015 10:34 pm

Will be the IACV I bet... had this happen to me once also... easy fix...

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